What is the value of for a positive integer ?

MATHEMATICS · Single correct · A Level · Mathematics · Sequences and series · Sequences and series

Problem

What is the value of

\displaystyle\sum_{k=1}^{n} 1\;

for a positive integer

n

? (a)

n+1

(b)

\dfrac{n(n+1)}{2}

(c)

n

(d)

1